Definition of lambda
1 : the 11th letter of the Greek alphabet — see alphabet table
2 : an uncharged unstable elementary particle that has a mass 2183 times that of an electron and that decays typically into a nucleon and a pion
From the M-W Editors
Origin and Etymology of lambda
Middle English, from Greek, of Semitic origin; akin to Hebrew l�?medh lamed
First Known Use: 15th century
Medical Dictionary
Illustration of lambda
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Britannica.com: Encyclopedia article about lambda
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